/**
 * Copyright (c) 2006-2015, JGraph Ltd
 * Copyright (c) 2006-2015, Gaudenz Alder
 */
mxCodecRegistry.register(function () {
  /**
	 * Class: mxRootChangeCodec
	 *
	 * Codec for <mxRootChange>s. This class is created and registered
	 * dynamically at load time and used implicitely via <mxCodec> and
	 * the <mxCodecRegistry>.
	 *
	 * Transient Fields:
	 *
	 * - model
	 * - previous
	 * - root
	 */
  var codec = new mxObjectCodec(new mxRootChange(),
    ['model', 'previous', 'root'])

  /**
	 * Function: onEncode
	 *
	 * Encodes the child recursively.
	 */
  codec.afterEncode = function (enc, obj, node) {
    enc.encodeCell(obj.root, node)

    return node
  }

  /**
	 * Function: beforeDecode
	 *
	 * Decodes the optional children as cells
	 * using the respective decoder.
	 */
  codec.beforeDecode = function (dec, node, obj) {
    if (node.firstChild != null &&
			node.firstChild.nodeType == mxConstants.NODETYPE_ELEMENT) {
      // Makes sure the original node isn't modified
      node = node.cloneNode(true)

      var tmp = node.firstChild
      obj.root = dec.decodeCell(tmp, false)

      var tmp2 = tmp.nextSibling
      tmp.parentNode.removeChild(tmp)
      tmp = tmp2

      while (tmp != null) {
        tmp2 = tmp.nextSibling
        dec.decodeCell(tmp)
        tmp.parentNode.removeChild(tmp)
        tmp = tmp2
      }
    }

    return node
  }

  /**
	 * Function: afterDecode
	 *
	 * Restores the state by assigning the previous value.
	 */
  codec.afterDecode = function (dec, node, obj) {
    obj.previous = obj.root

    return obj
  }

  // Returns the codec into the registry
  return codec
}())
